Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef32121c5c6459ce…

MALICIOUS

PDF

79.0 KB Created: 2021-03-20 04:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: abf224061e3755bd4ee29fb54b55a5e7 SHA-1: 9d13245dc9abfc2b1beac85ff4206d4ff2a87fb1 SHA-256: ef32121c5c6459ced12ac91d7c8e8e373334d9378617e3cab748f2dcb332a44d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=ernest+holmes+living+the+science+of+mind+pdf PDF link annotation
    • http://mujumuvibofa.iblogger.org/wanikivigopesakijewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5fda73cbbbcba.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/a9iz3bj/39218993317.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/WggK4HJ/jawuwujajapekozikodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_6023dba749fe4.pdfIn PDF document text
    • http://bofarutavuxeli.iblogger.org/71462958995.pdfIn PDF document text
    • http://ranomurivokav.22web.org/lg_vrf_air_conditioning_system.pdfIn PDF document text
    • http://detodefinedex.22web.org/minecraft_windows_10_edition_beta_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_6039575da7fd5.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/34441470321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db791352-14ad-43e7-a31d-a688f59b1e94/mafizomitaliwazikolis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8810507-3909-491b-aff3-5e01fc663d9a/pobugimanizikeporudod.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/xamenazikanepep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb1022d-beeb-4d14-af70-12482a0e8eaf/41012835892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea51a243-a2b5-4931-b7a1-bbbd6767d958/18586030315.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/bandcamp_app_for_android.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/pharmacology_drug_classification_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1eb8b3-1bc3-4675-b9ee-d4fcf56649a4/39923923277.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 5376 bytes
SHA-256: ed067818ac255a3c8e3af847f37a057b6d9176aec2b4e0519e62ebaa3487bccb
font_01_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 10832 bytes
SHA-256: dd8dc56a03adf7f93f1b0e96423cb6e0f9af01a5906c839ca1c2b62349aff4df

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